Cisco PIX 525 and Multiple Outside Interfaces

Hello, I was wondering if someone can help, I am fairly new to PIX's but have been using firewalls for a long time so please bear with me.

We are in the process of integrating a new ISP into out infrastructure, During this there will be a period of time where the both WAN links are active to allow a cross over for our external services. I would like to know how to have two active outside interfaces to allow us to migrate our customers from one service to another without taking the Old Link down.

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I am happy to keep the defualt route on the old link until it is turned off, then change the defualt route. I just want to allow people in via the new link so we can get customers to test the service before we cease the old lines